Yealink SIP-T48G Administrator's Manual page 215

Configuring Basic Features
Details of Configuration Parameters:
Parameters Permitted Values Default
account.X.session_timer.enable 0 or 1 0
Description:
Enables or disables the session timer for account X.
0-Disabled
1-Enabled
If it is set to 1 (Enabled), IP phone will send periodic re-INVITE requests to refresh the
session during a call.
X ranges from 1 to 16 (for SIP-T48G/T46G/T29G).
X ranges from 1 to 12 (for SIP-T42G).
X ranges from 1 to 6 (for SIP-T41P/T27P).
X ranges from 1 to 3 (for SIP-T23P/G).
X ranges from 1 to 2 (for SIP-T21(P) E2).
Web User Interface:
Account->Advanced->Session Timer
Phone User Interface:
None
Integer from 30
account.X.session_timer.expires 1800
to 7200
Description:
Configures the IP phone to refresh the session during a call at regular intervals (in
seconds) for account X.
If it is set to 1800 (1800s), the IP phone will refresh the session during a call before
1800 seconds.
X ranges from 1 to 16 (for SIP-T48G/T46G/T29G).
X ranges from 1 to 12 (for SIP-T42G).
X ranges from 1 to 6 (for SIP-T41P/T27P).
X ranges from 1 to 3 (for SIP-T23P/G).
X ranges from 1 to 2 (for SIP-T21(P) E2).
Example:
account.1.session_timer.expires = 1800
Web User Interface:
Account->Advanced->Session Expires (30~7200s)
201